package Exam.view;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet(name = "LoginOutServlet",urlPatterns = "/out.action")
public class LoginOutServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        HttpSession session = request.getSession(false);//防止创建Session
        if(session == null){
            response.sendRedirect("/index.jsp");
            return;
        }

        session.removeAttribute("user");
        response.sendRedirect("/index.jsp");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        this.doPost(request,response);
    }
}
